2nd attempt, this time I've decided makes more sense to just produce
a warning.

Change-Id: Iaf373a2d38e8f47266b00ea869de38a584788d45
Reviewed-on: https://gerrit.libreoffice.org/37598Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Chris Sherlock <chris.sherlock79@gmail.com>